Passage Summary: Squirrel monkeys will die out unless humans help them, but they'll be fine if we save enough of the specific forests where their favorite snacks grow.

Reasoning: Conservation is a necessary condition for squirrel monkey survival, and preserving second-growth forest is a sufficient condition for their survival.

Analysis: This stimulus provides a set of conditional relationships. We are told: Survival requires Conservation (If Survival -> Conservation). We are also told: Forest Preservation leads to Survival (If Forest -> Survival). By transitive logic, if we preserve the forest, the monkeys survive, and if they survive, conservation must have occurred. Therefore, preserving the forest is a form of conservation. Look for an inference that combines these logical links without overstepping the bounds of the provided facts.